PIC16F1933-ESLASHP datasheet(329/418 Pages) MICROCHIP

329 / 418 page

Preliminary

DS41364A-page 327

PIC16F193X/LF193X

EXAMPLE 23-4:

FLASH PROGRAM MEMORY READ

FIGURE 23-1:

FLASH PROGRAM MEMORY READ CYCLE EXECUTION

* This code block will read 1 word of program

* memory at the memory address:

PROG_ADDR_HI : PROG_ADDR_LO

data will be returned in the variables;

PROG_DATA_HI, PROG_DATA_LO

BANKSEL

EEADRL

; Select Bank for EEPROM registers

MOVLW

PROG_ADDR_LO

;

MOVWF

EEADRL

; Store LSB of address

MOVLW

PROG_ADDR_HI

;

MOVWL

EEADRH

; Store MSB of address

BCF

EECON1,CFGS

; Select Configuration Space

BSF

EECON1,EEPGD

; Select Program Memory

BCF

INTCON,GIE

; Disable interrupts

BSF

EECON1,RD

; Initiate read

NOP

; Executed (Figure 23-1)

NOP

; Ignored (Figure 23-1)

BSF

INTCON,GIE

; Restore interrupts

MOVF

EEDATL,W

; Get LSB of word

MOVWF

PROG_DATA_LO

; Store in user location

MOVF

EEDATH,W

; Get MSB of word

MOVWF

PROG_DATA_HI

; Store in user location

Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4

BSF EECON1,RD

executed here

INSTR(PC + 1)

executed here

Forced NOP

executed here

PC + 1

EEADRH,EEADRL

PC+3

PC + 5

Flash ADDR

RD bit

EEDATH,EEDATL

PC + 3

PC + 4

INSTR (PC + 1)

INSTR(PC - 1)

executed here

INSTR(PC + 3)

executed here

INSTR(PC + 4)

executed here

Flash Data

EEDATH

EEDATL

EERHLT

INSTR (PC)

INSTR (PC + 3)

INSTR (PC + 4)

PIC16F1933-E/P Datasheet(PDF) 329 Page - Microchip Technology

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